Compressor



March 15, 1960 ca. H. SUDMEIER 2,928,588

COMPRESSOR Filed Oct. 24, 1956 5 Sheets-Sheet l INVENTOR GUSTAV H. SUDMEIER 7M VW 20 ATTORNEYS March 15, 1960 ca. H. SUDMEIER COMPRESSOR 3 Sheets-Sheet 2 Filed Oct. 24, 1956 L a Mlf'drl'll'i m V MUM/7 y rllllllllrlll/fim rn I INVENTOR GUSTAV H. SUDHEIER ATTORNEYS March 15, 1960 G. H. SUDMEIER 2,923,538

COMPRESSOR Filed Oct. 24, 1956 3 Sheets-Sheet 3 FIG. 6.

INVENTOR GUSTAV H. SUDMEIER ATTORNEYS COMPRESSOR Gustav H. Sudmeier, Torrance, Calif.

Application October 24, 1956, Serial No. 618,127

' 7 Claims. (Cl. 230-139 This invention has to do with rotary compressors of the type commonly employed in refrigeration equipment;

An object of the invention is to provide a rotarytype compressor having several novel features of construction and possessing increased efficiency over prior compressors of this type.

Another object is to provide a novel construction in a rotary compressor which makes for ease of assembly. In

this connection it is an object to provide novel means of mounting the roller on the crank section of the crank shaft which permits of radial adjustment of the roller during assembly. This enables the provision of close tolerances and the necessary adjustment of the roller for a perfect fit within the roller housing. I.

A further object is to provide a rotary compressor which is so constructed that it can'be installed to run in either a horizontal or vertical position.

Another object of the invention is to provide a rotary compressor having a free or floating motor-compressor shaft with a single bearing ball at each end and means for adjusting the spacing of the balls.

n ted States Patent" i A further object is to provide a rotary compressor which is exceptionally quiet in operation and, in this connection, itis an object to provide a novel exhaust valve and housing which is designed to muflie the ordinary sound generated by the exhaust gases and restrict the action of the valve.

.Still another object is to provide a novel lubrication system wherein oil at a greater pressure than the pressure of the compressed gas is fed through the bearings of the motor-compressor shaft and fed to the roller in a manner to provide an oil seal for and around the roller, thereby greatly increasing the efliciency of the compressor over conventional devices.

A further object is to provide a compressor having a housing of aluminum or other light-weight metal and having novel mounting means which precludes the compressor elements being adversely affected by the relatively greater expansion and contraction of the housing.

Another object is to provide a compressor in which the motor rotor serves as a centrifuge to minimize the possibility of oil getting into the intake port.

A further object is to provide a compressor which is so constructed that the displacement can be readily varied merely by substitution of a different sized roller and a crank shaft of different throw.

These and other objects will be apparent from the drawings and the following description. Referring to the drawings:

Fig. l is a sectional elevation of a compressor embodying the invention, the plane of the view being indicated by line 11 on Fig. 2;

Fig. l-A is an enlarged fragmentary sectional viewof the roller mounting on the same plane as Fig. 1;

Fig. 2 is anend elevational view in the plane 2+2 of Fig. l, the view being partly broken away;

Fig. 3 is a sectional view on line 33 of Fig. 1;

Fig. 4 is a fragmentary sectional view on line 4-4 sectional view on 11, and the compressor unit, designated 12, are sealed within a housing 14 into which the compressor unit ex"- hausts. The housing comprises a pair of mating sections, designated 15 and 16, which are provided with flanges 15', 16' for abutting relation, a suitable gasket 17 being provided therebetween. The housing sections are secured by a plurality of cap screws 18. In this connection it may be noted that the housing sections are generally cylindrical except for the bottom portions thereof, designated 20 and 21. Peripheral fins 22 are provided on the housing for cooling. The fin area is extremely large, r'esulting in efiicient cooling, which contributes to the over-all efliciency of the device.

Housing section 16 supports the motor 11 which is preferably mounted therein by means of a shrink-fit of the motor stator 25 within the cylindrical wall 26. End wall 27 of the housing section 16 is provided with suitable electrical terminals 28 mounted in a plate 29 for the purpose of passing electrical current through the cas-' ing to the motor, plate 29 being embedded in the housing generally 36. This is mounted. in housing section 15 by means of cap screws 37 which pass through recesses 38 in the rim of flange portion 39 of member 36 and into threaded bores 40 in three circumferentially spaced mounting bosses 41 of the casing. In order to compensate for the expansion and contraction of the housing, which is preferably made of a light-weight metal, I provide a conical-type washer 37 or the like between the head of the screw 37 and the parts 36 and 40. With this construction, the expansion and contraction of the housing has no effect upon the compressor units close tolerances.

Member 36 has an elongated tubular section 421m which the shaft 32 is received. The latter has two axially spaced, grooved bearing areas 43 and 44 which are journalled within the bore 45 of member 36. At the com pressor unit end, the shaft terminates in a cylindrical section 46 of reduced diameter and intermediate thisand the bearing section 43 is an eccentric section 47 upon which is mounted the rotor or roller 48 of the com end of the shaft 32 is recessed'at 55 to partially receive 4 the ball. i i

The other ball, 51, is adjustable within a bore 57 in a cap 58, an adjustment screw 59 being threaded into a counterbore 60 of the cap. v, Mounted-against the bearing flange 36 is the cylinder Patented Mar.

view as indicated by line 6'2 stirs easier-seer unit. Adjacent this is a plate 63 fl'fiiii fistfisene side or the cylinder chamber 65 in which the roller operates.

assembly; 'lfhree screws 66 secure the cylinder 62. to the bearing flange. I of screws 67 fasten plate 63 it} the cylinder and the bearing flange.

Giand threading' into m mber 36.

sage 70 which terminates in the inwardly projecting tubu l'ar 'seetion 71'- of the housin Mounted inthis'is' a snsa mse it when eiterids i'ntos'a bore 13 in theicap sit, Tess 7; so1 tinses the" inlef'passage to a bore- 14 iii member 63, the latter p bviding eommunication to chamber 65 in the cylinder 62.

Substnti ll'y opposite the cirehmferentiallyl a few degrees therefrom is an exhaust port 76 in member 36. In the region surrounding the cities; port, member 36 hash first counterbor'e 77 and beyond this, a second eeunierbore 78, as best shown in Fig. 8, An exhaustvalve seat 80 is positioned in the counterbore 77 andthis is shown as having an'undercut surface iii to accommodate a seal ring 82. Member 80 provides flat outer surface against which a hit or feed or disk exhaust valve 83 seats. The ai've isurged towhrd thekseat by a compression sprint; i

Surrounding theviilve seat area; I provide designated 36, which may be moiinted on member 36 screws 87." The muffler ineh'ides ariinwa'ralyprejeeting portion SShaving' a conoidal, surface :19 which terminates in a, shoulder 90. Portion $8 limits the travel r the serve. outwardly of th shoulder 90 is a; lndrical semen and beyond this a shoulder 92; The mufller 85'' servesto retain the valve seat and valve ng and, for the purpose of securing the valve seat, Lprovide s valve guide tube 94 which extends between shoulder 92 of the rnufiier and an ann lar shoulder 95 on the valve seat. Member 94 is provided witha plu rality of apertures for theeseape of compressed gas. in "this eqn'nectionit hould be noted that the countersect i oh 78 of member 36 isof sufficiently large diameter to provide a passage, from such apertures toa spaee 99 within the inu fiier'. From the space the exhaust must flowinto a or'np'artment 100 from whi h it sta e into the interior of the housing through alport 101'.

Mam a 6 which slidably receives a divider blade 103. A cap 104, which is detachably secured to member 62 by screws 105, closes the end of this slot and a compression siir n mi ,ii t fi seir w ih cap n he terend ofthe divider blade, as shown in Fig. 5, The cap hasa reliefpassage 107.;

t 9 t-th .fse re s in which the roller 48 is mounted upon shaft 32. This ess mrlishs jins i a .w ysi d r assembly l mited amount of adjustment can be made ,of the .rotor;

radially of the eccentric portion ofthe shaft.- Referring The cap 58 completes this Several; screws es fasten diseases, passing throug members 6: and.

inlet port '74 but spaced Th housing section is provided with an inlet pas-f lower portion ofthe casing. toanl oil passageway 125 in the cap 'to supply the gear pump. An. oil delivery 7 a monies-,1

gear pump comprising a drive gear 120 fixed to the reduced portion 46 of the shaft, and a driven gear 121 meshing therewith. The gears are housed in a suitably shaped recess 122 in plate 63. The driven gear rotates on a dowel pin 123. An oil tube 124 leadsfrom the passage, designated 127,, extends from the pump through members 63', 64, and 36 to deliver oil to the interior of portion 42 of niember36 to a space 128 in the region of the central portion of the shaft. From here the oil passes axially of the shaft in both directions to lubricate the parts. In this connection, it should benoted that the shaft portions 43 and 44 are provided with axially extending flat sections 43' and 44', of which there may be two on each portion, to facilitate travel ofthe oil along the shaft, Preferably the fiat sections 43' are wider thanthe others; A pressure relief valve'130. is

provided in a relief passage 131 leading from oil delivery passage 127;

It will be apparent that, with the construction described, oil passes along the shaft to the eccentric portion thereof and to the cup and roller, thus affording positive lubrication of the compressor unit and oil-cooling of the parts where they are subjected to the greatest wear. Oil is returned to the bottom of the casing by i the oil return passage 135 (Figs 1 and 'l-A).

. of bore 45 of member; 36, the motor rotor acts as a Another feature of the' lubrication system is the fact that bilpassing along the shaft to the motor rotor assists in cooling the motor. 'Also, as the oiltleaves the end centrifuge thereon, separating entrapped gas in the oil from 'th'ejoilfi I t It may also lie-pointed out thatone of thefeatures of the construction described is that it is possible to change'theWoIumetric'capacity of the compressor unit by merely changing theroller and the shaft. So far as I know, in prior devices it has been necessary to change at least five parts of the compressor unit in order f the invention is them-annex" to alter the volumetric capacity. V

'fIt will be apparent that the above described constructionjaccomplishes the various objects and features herei'nb'efore pointed out. While I have disclosed a preferred form of the invention, it'is contemplated that various changes and modifications'can be made therein without departing from the scope of the invention as indicated by the claims which follow.

I claim: i a 1. In a rotary compressor, a motor-driven shaft having an eccentric portion, means forming a cylindrical chamber around the eccentric portion of the-shaft con centric with the axis of rotation of the shaft, a cup member on saideccentricportion of the shaft having a cylindrical inner surface and a cylindrical outer surface,

' said 'surfaces'being eccentric with respect to eachother,

particularly o Figs. 1 and l-A, I providea threaded 6 rotatable on-said eccentric portion of the shaft when vun= geisha 47 onthe eccentric part of the shaft. (on the :sh a'ftl I mount .a :cup memb r: 110" wh ch is providedwith a'cylindrical outer surface 111.

fasteningmeansonsaideccentric portion of 'IhC shaft Within, said cupifme'mber securing said 'cup member' therefdand faigainst rotation, said cup member being secured by said fastening means, and a compressor roller with respect to theinner sprees so that, during assembly, by rotating the cup memes an {the shaft portion theroller; may be adjhs ted radially slightly, 'Whenetl ed uponthe'shaftby means of a nut 1-13, ,asiiitab1e 114, b eiii'g used between m ns;

r feature of the invention is -lubrieation, sys

member, said roller being ada'ptedftomake rolling contact with the inner peripheral wall of said cylinder chamber upon rotationofjsaid shaft.

2. The construction-set forth in claim 1 in which the fastening means securing said cup member to theishaft comprises-a threaded portion onthe eccentric portion of the shaft "and a nut on said threaded portion, and in "which said cup has a counterbore receiving said nut.

- 3. In a compressor of the @rotary type, a housing, an

, electric motor contained in said housing, a rotary com- ;pressor unitfeontained ,inzsaid housing, a motor compressor shaftteommon to said motor and said compressor unit journalled in said compressor unit, and means limiting axial movement of'said shaft comprising a bearing ball at each end of the shaft, one of said bearing balls being resiliently supported by said housing and the other of said bearing balls being supported by said compressor unit, and means carried by said compressor unit for ad justing said other of said bearing balls axially of the shaft.

4. In a compressor of the rotary type having wall means forming a cylindrical chamber and having a motor-driven roller for operation therein, said means providing an exhaust port for said chamber, a valve seat in said means surrounding said port, a disk valve engageable with said seat to close said port, a valve guide tube surrounding said valve, and mufiler wall means closing the outer end of said tube and securing the same in place, said mufiler wall means providing a mufller chamber surrounding said tube, said tube being provided with apertures providing communication from the interior thereof to said chamber, said mutiler wall means being apertured at a point remote from said valve tube to provide an outlet for gas in said mulfler chamber.

5. In a compressor of the rotary type embodying a freely rotatable piston roller in a cylindrical chamber, a first housing section, a second housing section, means detachably securing said housing sections together, a motor unit rigidly mounted in said first housing section, a compressor unit in the second housing section, flexible means mounting said compressor unit in said second housing to compensate for thermal expansion and contraction of said housing, and a common rigid shaft extending from the motor unit to the compressor unit having an eccentric portion upon which the piston roller is mounted.

6. A construction as set forth in claim 5 in which said motor unit is mounted in said first housing member by a shrink-fit of the motor stator in said first housing member.

7. In a rotary compressor, a casing, a bearing flange mounted in the casing and having a cylindrical bore, a

motor-driven shaft journalled in the bore of said bearing flange and having an eccentric portion, a roller carried upon the eccentric portion of said shaft, means forming a cylindrical chamber around said roller, said shaft having an extension beyond said chamber, an oil pump an oil return passage from said cylindrical chamber at a' region inwardly of the periphery of said roller to a region within the casing exteriorly of said chamber, said bearing flange being open at the end opposite to the end to which the cylindrical chamber is adjacent.

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